Extraplot
Draw the missing part of a real chart, then discover how the data actually changed.
Practice · Five real-world charts per round How to play ↓
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HOW TO PLAY
Read a real data series up to its cut-off, draw the hidden continuation and reveal what actually happened. A round contains five charts, scored across the whole hidden path rather than only its endpoint.
- Start a practice set, or choose a captured GuessDash date in Chart set. Read the title, units and both axes. A position can mean a year, an age or a census observation; use the displayed labels.
- Use the known curve as a starting point and draw through the shaded observations to the end. You are estimating already recorded data. Redrawing revises a stretch; gaps between marked positions are interpolated.
- For keyboard drawing, focus the chart. Left/Right select a position; Up/Down adjust it by 2% of the vertical range, or 10% with Shift. Home/End select the first/last position; press Up/Down to set its value.
- Select Reveal when every required hidden position has a value. The actual curve appears over your line with a chart score, average miss, data summary and source. If a save fails, the live line and prior saved record are retained so you can retry.
- Compare the whole hidden path. Each chart earns up to 1,000 points from mean absolute error divided by the full vertical range, with a 1% full-score tolerance. Complete five charts for a total out of 5,000 and copy a link to the same chart set.
- Choose New practice set for another five-chart deal. Previously dealt series are avoided while fresh ones remain, then review charts are labelled. Use Replay this set to keep the same questions with a separate labelled score; the first result is retained.
Before you play
- Practice draws from 405 World Bank series across 10 topics and 47 places. Once the collection is used, repeated charts are marked Review.
- Two original five-chart rounds dated 9 and 11 November 2026 are also available, with separate results.
- Check the axis labels and units: some charts use age or census labels rather than calendar years.
New practice set deals another round. Reload continues the saved set. Practice results, original rounds and replays stay separate; saves do not transfer to GuessDash or other devices.
Game credits
Independently hosted games keep separate saves and scores from their original sites.